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Finding the Fourth Proportional to 525,891.40, 788,837.10 and 420,915.40

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Solution

The fourth proportional to 525,891.40, 788,837.10 and 420,915.40 is: 631,373.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    525,891.40 : 788,837.10 = 420,915.40 : x
  2. Step 2: Convert to fraction form
    525,891.40/788,837.10 = 420,915.40/x
  3. Step 3: Cross multiply
    525,891.40x = 788,837.10 × 420,915.40
  4. Step 4: Simplify right side
    525,891.40x = 332,033,683,481.34
  5. Step 5: Solve for x
    x = 332,033,683,481.34/525,891.40
  6. Step 6: Final answer
    x = 631,373.10

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.